16
CURRENT AND VOLTAGE INSTRUMENT TRANSFORMERS
INSTRUCTIONS FOR INSTALLATION, USE AND MAINTENANCE
Appendix 3
Technical background
ated with the excitation of one or more saturable inductors
The saturable inductor is usually present in the form of an in
earthed network is one of the most common ferroresonance
VT Guard Pro is an advanced security device which protects
MV inductive voltage transformers (VTs) against ferroreso
versions of VT Guard Pro:
a) VT Guard Pro
ture allows the device to check itself (functionality of its cir
cuits) and is able to send information about its state into a
for protection of the VTs against ferroresonance please fol
There is an additional factor that can in some cases reduce
or totally eliminate the risk for ferroresonance and it is
factor shifts the operating point towards lower flux values
Recommendation
Rated voltage factor: We recommend using the voltage
age factor if the requirements for the secondary winding are
Voltage of residual
winding
Value of Rdamp Power Dissipation
Ω
Ω
To Next Page
Loading...
